1556004161880 has 384 divisors, whose sum is σ = 5800469875200. Its totient is φ = 354367236096.

The previous prime is 1556004161851. The next prime is 1556004161893. The reversal of 1556004161880 is 881614006551.

1556004161880 is a `hidden beast` number, since 1 + 5 + 56 + 0 + 0 + 416 + 188 + 0 = 666.

It is a super-2 number, since 2×1556004161880² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1310870647 + ... + 1310871833.

It is an arithmetic number, because the mean of its divisors is an integer number (15105390300).

Almost surely, 2^{1556004161880} is an apocalyptic number.

1556004161880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1556004161880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2900234937600).

1556004161880 is an abundant number, since it is smaller than the sum of its proper divisors (4244465713320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1556004161880 is a wasteful number, since it uses less digits than its factorization.

1556004161880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663 (or 2656 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 1556004161880 in words is "one trillion, five hundred fifty-six billion, four million, one hundred sixty-one thousand, eight hundred eighty".